Expansion valve and governor



A. K. HINCHMAN.

EXPANSION VALVE AND GOVERNOR.

APPLICATION m50 NAHv 22,1919. .RENEwED nec. 7.1921.

1 ,406,01 4, Patented Feb. 7, 1922.

(UNITED,STATESPATENT ,irrflci-z...,'lv

ALvAx. Him-:Hman .oF-PHILADELrnIA, rENNsYLv-ANIA, AssIGNonLBYfnsNE v ASSIGNMENTS, orjoNneFoUnrnmo CHARLES HUQUIMBY ANDoNE-rotm'rn 'ro j CHARLES H.' uon'romrornfor PHInfinita-P1111,PENNsxmvnlmx.ff` f f. Specification of Letters Patent. i

vanvn man doviramila"` l Patented Feb. 7,1922.

Application ined irarh ze, v191e,"seraiim.'2s1ge1zs. .nenewei necember 7,2 1921'. semina. 520,717.

To all whom it may donc/emi." 'l

Be it known th t1, Aranay Kl.' HINc'rrMAN, a citizenl of the United States, residingat Philadelphia, inthe county Vof Philadelphia and Statelof Pennsylvania, khave invented certain nevfvfand 'useful'k Improvements in Expansion Valves and Governors; andA I do hereby'declare the following to be` a full, clear, and exact description of the invention, such as 'Will enable others skilledn the art to vvhich'it appertains to make and use the same.`.

This invention relates to improvements in expansion valves and governors andhas for one of its objects the provision of means'for controlling fluid or air pressureso astofkeep4 Y the pressurevat a predetermined degree from a high pressure source.

Another 'object of this invention vis 'the provision of high and low `pressure chambers and double acting piston`,`lvvhereby ja predetermined pressure the low pressure chamber, Whil`e thesame is fed from the highH pressure chambe'n 1 A urtherfobject ofths vinvention is the provision of means vvherebythegpiston of the high 'pressure' chamber ,canJ be balanced so as to reduce the pressurelin and y from the low pressure chamber. I

A further object of thifs inventionisfthe,l

provision oan auxiliary -v'controlling means adapted .to admit high .pressure -from the source directly into the lovv ypressure chamber Aas desired so' as to further-,i reduce the pressure in and from? theflow pressure chamber;

A still furthenobjectof is the provision :of an expnsi n -valvefand governor of Athe above lstated character,

which shall be simple, Ydurable andy erlicient,

and'which may be manufactured 'sold at a` comparatively lotv"cost f ,Y With these and other objects invieyv'ins Will becomeN more appare t as'the descrip'- tion proceeds, the y invention consists'in eer tain novel features-fof 'constructiomf com-v binatiomand arrangementof parts, as will be hereinafter 1nore, v fully `described and claimed. f" 'l' For completeunderstandingofmy vention, referenceis to be had'to'the. follow@V ings, in which can be kept 'atfand from ing.v description,I and"accompanying drav'v l v Y f fluid or air pressure inthe low 4pressure expansion valve and governor constructed in accordance with my invention. AFigure 2 isa similar view modified form vof my invention.

Referring in detail to the drawing, .the numeral 1 indicates a'casing having formed in its lower end an intake port 2 which is adapted to be connected in rany well known manner to a fluid or air vhigh pressure source 3. The inner end of theintake port 2 has formed thereon a valve seat 4 which is rlocated Withina high pressure chamber 5 and is adapted to receive during the operation of the device a valve 6 4formed'on one head cfa doubleacting piston 7.` A lowy pressure chamber 8 is formed in theupper portion of the casing l and hasits upperend closed by a removable cap or coverf9fthatv illustratingv a isthreaded or otherwise secured in ftheupper end of the c'asingi `The high: and. low pressure chambersarel divided by. 1av web or plate 1Q which is threaded in thewall of thecasing as shown at 11 and is `provided-.Witl-1 a y double packing gland 12, one portion of which is disposed kin the high pressure cham-- ber, While the otherportion is disposed yin .thelow pressure chamber and slidably re-' ceives thestem v13 of the double acting pis t v ton 7, permitting the heads 14 and -lgto Work in the low` and high pressurecharnbers. The head 14 which islocated -in the low preseY sure chamber has aratio of about four. to onej sesVv ofthehead 1.4 which isv llocated'infthe pressure chamber. .Thelowpressure chain-4 ing 1 and leadiromthe higlrpressurechamf,

ber to the upper end'of thelovv pressure chamber :so thatthe vfluid ory airl pressure can enter. the low pressure chamber from lthe high Y pressure. chamber `When .the double acting pistonv is upand as the pressure against the ,piston head1 4overcomes -the pressure against the piston head `115,-; Whch yis' less than the ,pressurei against,.ther piston head14mowingto. the size of the sameover .1,3

the piston head 15 the latteris forced downwardly seatingthe valve thereof against the valve -seat andat the same time closing the lowerendsof thepassages 16 and 17. The

chamber which is at the desired degree then l I passesoutWardly therefrom way of discharge pipes 18 leading from the upper end of'saidlowlpressurechamber and which are adaptedfto be connected to, the device that is to receive the liquidjorain ressure at the desired degree. As soon as te pressure Y 1n the low pressure chamberestarts to de-VVV crease, the high pressure against the piston headi; or; the valve thereof moves the piston upwardly 'permitting the liquid or air pressure vtoenter the highl pressure chamberand pass into the low pressure chamber by way of" the passages 16 and 17,' thereby kee 1n an even ressure in the low oressure chamber :at all times and to the device that,

isusing the liquid or air pressure at the predetermined degree.

` An adjusting'rod 19 passes throughthe turned. o

v*Thejpassage' 17 is provided with a .branchk l cap or vcover'of the casing andV is` screw threadedtherein and isfprovided with La head' 2O so thatthe stroke of the piston 7 canbe regulated as desired. AV lock nut 21 is mounted on the'rod 19 and is adaptedto be 'turned into: engagementv with the cover orcap forlock-ing the rod' at various adjusted positions and'l which is provided' with handles 22 sothat the vsame can be readily 23 which leadsto an auxiliary chamber'24 formedbetweenthe piston head 14V and the weblor plate -10and is controlled by la needle valve 25 having a lock nut26.` By opening thejneedle valve,iluid or airpressure will be admitted to the auxiliary'chamber which willbalance the piston andthereby reduce Vthe amount "of-pressure required inthe low fpressure.' chamber in order to seat the valve Y, of, said piston. Thisfis provided for incase it is desired to 'use a lower liquid or' air pressure from the lowr pressure chamber.

-" The-passage 17v is provided with a branchl 127 `which leads to theintake port' of the casing and is provided with a needleV valve' 28 having 'a lock nut 29l whereby said branch Vcan 'be controlled; By opening the valve 28 Y high pressure from the source can be admitted directly tofthe low pressure chamber,

'even whenthe Vvalve is closed'jthereby pervvinittinv highfpress'ure from the pass directly out through the outlet ports 18. Referring Ato Figure 2 which illustrates port 31"adapt'ed to be connected to the highv pressure-source 3'1andfi'sequipped with a valve seat-32 adap'tedto be engaged by av valve"33"carried by the head 34 of a. doubleacting piston 35; l The'double 'acting piston rchan'l'bers 36v andy 37. f' vbyfthefstem lofthe double actingpiston 35 and is located in the 'low pressure chamber 35 4'operates within Vhi Uh and low` pressure piston 38 is carried 37' andwis'fof a ratiov greater than' that of' the `'piston 34. The highy and.. lovvl pressure source to y chambers vary in sizes according to theratio of the pistons and are separated by a plate 39 l'secured'f to `an. annular shoulder4 formed within the casing 1" bybolts'l 40.- The plate .e9fis,.pmvidedwithrastalling box 415lt0 s1dand is. controlled by a needlefvalve V45, soi

that thehigh pressure directly'from.v the intake port may be conveyed to the low pressure chamber when desired `though the valve is closed. l Vbranch 46 is formed the casing 30, and leads, from the passage 43 toy an auxiliary chamber 47 vformed; by the plate 39 andthe upper face 'of the piston 34providing construction wherein the degree of pressure required toseat'the' valve maybe lessenedY if desired by admitting pressure from the intake port directly.' into the aukiliary chamber; The branch 46 is controlledv by a needle valve 48.V i a A branch 49 leads Afrom the passage 43 to an auxiliary chamber 50 formed by the plate 39 and the piston 38 within the low pressure chamber so that the pressure can be admitted from the intake port 31 intoth'e chamber for the purpose of increasii'igv the amount of pressure required to seat the valve'33. The branch'49 `is controlled by a needls valve 50.

The casingv30 is closedby a removable cap 51` secured in position by means of nuts 52 l and is provided with' an,adjustinglscrevv` 5 3 for limiting th'elmovement of the Vdouble acting piston 35." The cap 51 is provided with outlet ports to a device employinglovv pressure. Y

' Whiler I have 'shown' and defiscrib'ed the pre.-k ferred embodiment of my invention, it will be understood Vthat minor changes in'con struction, combination end arrangement of parts may be made withoutfdeparting from the spirit and lscope of the invention-as claimed. Y.

Havin f thus described `my"k invention, what I ciim is :V-y i device of-.thevfcharacter set forth comprising a casing having high' andlow pressure chambers and said high pressure chamber having fan' intake 4 port provided with a valve seat, discharge pipes connected to the 10W pressure chamber, said 'casinghaving passages .leadingfrom the high `pres- 54 adapted to be vconnected izo for the low pressure chamber, said casingy having passages leadingfrom the high pressure chamber to the low pressure chamber, a

piston stem slidable in the web, a headv formed on each end of the piston stem and located in said chambers, one of said heads forming between itself and the webA an auxiliary chamber, said casing having a second passage communicating with one of the first named passages and the auxiliary chamber, a valve in said second named passage, one of said piston heads closing the first named passages when in one position, and a valve formed on the last named piston head and adapted to engage the valve seat when the piston closes the first named passages. c n n 3. A device of the character set forth comprising a casing, a web in said casing forming low and high pressure chambers, said highv pressure chamber port provided with a valve seat, discharge means for the low pressure chamber, said casing having passages leading from the ,high pressure chamber to the low pressure chamber, a piston stem slidable in the web,

a head formed on each end of the piston stem and located in said chambers, said heads forming between themselves and the web auxiliary chambers, said casing having auxiliary passages communicating with the first named passages and' the auxiliary chambers, valvesV in said auxiliary passages, one of said piston heads closing the first named passages when in one position, and a valve formed on the last named piston Y head and adapted to engage the valve seat when the piston head closes the firsty named passage. v

L1A device of the character set forth comprising a casing, a web in said casing forming low and high pressure chambers,

said high pressure chamber having an incomprising a casing,

having an intake -passage communicating with the high pressure chamber to the low pressure chamber, a piston stem slidable in the web, a head formed on each kend of the piston stem and located in said chambers, said heads forming between themselves and the web auxiliary chambers, said casing having auxiliary passages communicating with one of the first named passages, valves in said auxiliary passages, a second auxiliary passage communicating With one of the first named passages and with the intake port of the high pressure chamber below the valve seat, a valve for the second named auxiliary passage, one of said piston heads closing the first named passages when in one of lits positions, and a valve formed on the f last named piston head and vadapted to engage the valve seat when said piston is in a position to close the first named passages.

5. A device of the 'character set forth having one end open, a removable cover closing said open end of the casing, a web in said casing forming low and high pressure chambers, said high pressurek chamber having an intake port provided with a valve seat, discharge means for theylow pressure chamber, sald casing having passages leading from the high pressure chamber to the low pressure chamber, a piston stem slidable in the web, a head formed on each end of the piston stem and located in said chambers, a regulating screw adjustably secured to the cover and extending therethrough for regulating the movement of the piston stem, said heads forming between themselves and the web an auxiliary chamber, said casing having an auxiliary one of the first named passages and the auxiliary chamber, a valve in said auxiliary passage, one of said piston heads closing the first named passages when in one position, and a valve formed on the last named piston head for engagement with the valve seat.

In testimony whereof I affix my signa- --ture in presence of two witnesses.V

ALvA x. HINCHMAN. 

